Passing pointers from mex->octave->mex

[José Vallet]

Hello.

I have a C library with which I can create and manipulate some 
structures. What I would like to do (from octave):

1 - Call the C function that creates the structure, and somehow store a 
pointer to the structure for later use.
2 - Do some other things
3 - Call another C function from the library that will manipulate the 
created structure. Therefore I need to pass the pointer to the structure

How to make octave to store a pointer to a structure created in a mex 
file and how to pass that pointer to another mex file?

BR
Jose